Larson Davis SoundAdvisor 831C Reference Manual page 20

2.2.4 Powering On or Off
SoundAdvisor Model 831C
Understanding a Sudden Loss of External Voltage Event
When the external voltage is suddenly lost—if the external supply is disconnected or the
main power fails and there is no external battery—the 831C continues to run on internal
batteries if they are present and in good condition. If battery power is not present, the
831C immediately switches to an internal recovery battery and powers down safely.
Understanding the External Power Indicator
When connected to an external power source using the included USB cable, the External
Power icon replaces the Battery icon.
If your meter has fully-charged NiMH batteries and is plugged into a power source, this icon
indicates that it's using power from the external source, and is not charging or using any
power from the batteries.
Understanding a Low Power at Start Up Indicator
At start up, the 831C performs a power check. If the supplied power is too low, the low
power icon displays over top of the first display. For more information see Table A.5, "Low
Power At Boot-Up".
Understanding Low Input Power Indicator
When "Low Input Power" displays on the Power Control Page (see Figure 2-4 on this page),
the USB cable cannot supply sufficient power to charge the internal batteries. To resolve
this issue, contact Larson Davis (see back cover of this manual) and request the CBL138—
which is a 3-foot, USB 2.0 A Male to Mini-B, 5-pin Male 28/24 AWG Cable with Ferrite Core.
Powering On
Press and hold the ON/OFF button
LED under the button lights up.
Powering Off
There are 3 ways to power off the 831C:
1.
Press the ON/OFF button
top-left softkey to select Off.
2.
From any screen, press and hold the ON/OFF button
shut down sequence.
3.
Press and hold the ON/OFF button
shutdown.
CAUTION:
0
on the meter until the screen flashes and the green
0
once to access the Power Control page, then press the
0
for 10 seconds to force an immediate
Using this method may result in lost data.
Powering the 831C SLM
0
for 3 seconds to begin the
15